Abstract: An assembled hollow rotor shaft for a rotor, which rotates about a longitudinal axis, of an electric machine, may include a cylinder jacket that surrounds a shaft cavity, and end flanges disposed on both sides on the cylinder jacket. A shaft journal is disposed on each of the end flanges. An inlet is provided in the shaft journal of one of the end flanges via which a cooling medium can be conducted into the shaft cavity and onto an inner surface of the cylinder jacket. A cooling-medium distribution element within the shaft cavity may be formed symmetrically perpendicularly to the longitudinal axis, may receive the cooling medium, which enters via the inlet, via a receiving region, may guide the cooling medium via a removal region in a direction of the inner surface of the cylinder jacket, and may discharge the cooling medium onto the inner surface via a discharging region.

Abstract: An assembled hollow rotor shaft for a rotor, which rotates about a longitudinal axis, of an electric machine, may include a cylinder jacket that surrounds a shaft cavity, and end flanges disposed on both sides on the cylinder jacket. A shaft journal is disposed on each of the end flanges. An inlet is provided in the shaft journal of one of the end flanges via which a cooling medium can be conducted into the shaft cavity and onto an inner surface of the cylinder jacket. A cooling-medium distribution element within the shaft cavity may be formed symmetrically perpendicularly to the longitudinal axis, may receive the cooling medium, which enters via the inlet, via a receiving region, may guide the cooling medium via a removal region in a direction of the inner surface of the cylinder jacket, and may discharge the cooling medium onto the inner surface via a discharging region.

Abstract: A camshaft for actuating the gas exchange valves of an internal combustion engine. The camshaft includes a camshaft tube, a hydraulic camshaft adjuster, a valve for controlling the hydraulic fluid supplied to the camshaft adjuster and an actuation device, arranged in the interior of the camshaft tube, for actuating the valve. The actuation device is secured against displacement in the axial direction. The camshaft is light-weight and functional elements in addition to the actuation device and optionally the valve can be integrated into the interior of the camshaft. It should furthermore be possible to arrange an oil or vacuum pump at the end of the camshaft opposite the camshaft adjuster, the pump being drivable by the camshaft. The actuation device is designed as an electromagnetic, piezoelectric or electrical actuator and is connected to the camshaft tube such that they rotate together.

Abstract: A camshaft for actuating the gas exchange valves of an internal combustion engine. The camshaft includes a camshaft tube, a hydraulic camshaft adjuster, a valve for controlling the hydraulic fluid supplied to the camshaft adjuster and an actuation device, arranged in the interior of the camshaft tube, for actuating the valve. The actuation device is secured against displacement in the axial direction. The camshaft is light-weight and functional elements in addition to the actuation device and optionally the valve can be integrated into the interior of the camshaft. It should furthermore be possible to arrange an oil or vacuum pump at the end of the camshaft opposite the camshaft adjuster, the pump being drivable by the camshaft. The actuation device is designed as an electromagnetic, piezoelectric or electrical actuator and is connected to the camshaft tube such that they rotate together.